Apparatus for transmitting and translating movement



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SUBSTITUTE FOR MISSING XR I Aug. 2, 1960. P. DAVEY 2, 47,5 CROSS REFERENCE APPARATUS FOR TRANSMITTING AND TRANSLATING MOVEMENT Filed April 21, 1958 2 Sheets-Sheet 1 V 2; N m i III Q.

FIG.3 ANPLIFICATION Z INVENTOR.

Peter Davey ATTORNQ P. DAVEY Aug. 2, 1960 I APPARATUS FOR TRANSMITTING AND TRANSLATING MOVEMENT Filed April 21. 1958 2 Sheets-Sheet 2 INVENTOR. 3r Davey ATTORNEY United States Patent APPARATUS FOR TRANSMITTING AND TRANSLATING MOVEMENT Peter Davey, Lake Hill, N .Y. (P.0. Box 97, Glenford, N.Y.)

This invention relates, in general, to the art of mechanical movements and, more particularly, to improved apparatus for transmitting and translating such movements.

The apparatus of this invention has many applications. It is especially useful in producing permanent records of vibrations on paper chart strips over a wide range of frequencies and amplitudes.

One of the important features of the invention is that it permits of ready magnification of the amplitudes of individual vibrations which accurately denoting the fre quency of the vibrations. This feature is realized by a simple and ready adjustment to obtain a desired amplification ratio within a selected range, such as ratios of 40:1, 20:1, 10:1 and :1.

The primary object of this invention is to provide improved and simplified apparatus for transmitting and translating mechanical movement.

Another object of the invention is to provide apparatus for readily producing permanent records of vibrations over a wide range of frequencies and amplitudes.

1" he invention has for a further object the provision of apparatus of the character indicated which is simple and compact in design, which is durable and sensitive in construction, which is reasonable in manufacturing cost, and which is capable of performing its intended functions in an entirely satisfactory and trouble-free manner.

The enumerated objects and additional objects, together with the advantages of this invention, will be readily understood by persons trained in the art from the following detailed description and the annexed drawings which respectively describe and illustrate an instru-' ment for producing permanent records of mechanical vibrations and having apparatus according to this invention incorporated therein.

In the drawings:

Fig. l is a view in side elevation of a vibration recording instrument, a side plate of the instrument being omitted for better illustration of parts within the instrument;

Fig. 2 is a cross-sectional view taken along line 2-2 of Fig. 1;

Fig. 3 is a view in elevation and on a reduced scale of the forward end of the instrument;

Fig. 4 is a cross-sectional view taken along line 4--4 of Fig. 1;

Fig. 5 is a cross-sectional view taken along line 5--5 of Fig. 4;

Fig. 6 is an isometric view of the apparatus for transmitting and translating movement shown in other views;

Fig. 7 is another isometric view similar to Fig. 6, as observed from another position;

Fig. 8 is a diagrammatic representation of the manner of amplifying vibrations with the apparatus of this invention, the parts being set to obtain an amplification ratio of :1; and

Fig. 9 is a diagrammatic representation of the manner of amplifying vibrations, the parts being set to obtain an amplification ratio of 20: 1.

Referring initially to Figs. 1, 2 and 3, the illustrated form of the invention includes a metal casing which is generally indicated by reference numeral 10 and which comprises a top wall 11, a bottom wall 12, a pair of side walls 13 and 14, a side palte 15, a rear wall 16 and a front cover plate 17. Walls 11, 12, 13 and 16 are integral while side wall 14 and plates 15 and 17 are removable to .permit of ready access to parts within the casing. Top wall 11 has a square aperture 18 and is provided with a transparent plastic window 19 which is disposed across the inner end of the aperture. Rear wall 16 has a similar square aperture 20. Overlying this aperture is a cover 21 which is hinged at its upper end to the rear wall. Front cover plate 17, as best shown in Fig. 3, has an elongated slot 22 formed therein. This plate is provided with graduations to indicate amplification ratios of 5:1, 10:1, 20:1 and 40:1. It will be understood that the instrument may be provided with additional graduations to indicate other amplifications, as required and depending on the construction of a particular instrument.

Positioned within the casing is a clockwork mechanism 23 for advancing a sensitized paper chart strip 24 along a selected path and at a predetermined speed. This mechanism may be of any suitable type known to the art and preferably comprises a housing 25 which encases a mechanical clockwork motor (not shown). Housing 25 supports a shelf or ledge 26. Disposed to opposite sides of shelf 26 are a first roll 27 and a second roll 28 which are rotatable about corresponding parallel axes. Roll 27 carries a supply of the paper chart strip 24, while roll 28 coacts with other devices to unwind the strip from its roll and advance the same along the illustrated path. Roll 28 may be termed a drive roll and is rotated in a clockwise direction by the clockwork motor. The chart strip, as it unwinds from its roll, moves in the direction of its arrow along the upper surface of shelf 26 and a portion of the peripheral surface of drive roll 28. Used portions of the chart strip may be withdrawn from the instrument by way of aperture 20. A resilient arm 30 is secured at one end 'to a bracket unit 31 and carries a pair of idler rolls 32 at its other end. As shown, rolls 32 bear against the chart strip to maintain the same in engagement with the drive roll.

A second bracket unit 35 is mounted on housing 25. One end of an arm 36 is secured to bracket unit 35 by a screw 37 and the other arm carries a resilient extension 38. A timing stylus 39 is aflixed to the free end of extension 38. This stylus is adapted to mark a notch on an edge of the chart strip at selected time intervals, such as every second, in a manner known to the art.

Positioned within casing 10 adjacent front cover plate 17 is a support unit 40. This unit is preferably made of a one-piece metal casting and, as best shown in Figs. 2 and 4 through 7, comprises a front member 41, a top member 42, a bottom member 43, a pair of spaced side members 44 and a pair of spaced lug members 45. Front member 41 has a slot 46 which is aligned with slot 22 of the front cover plate. A pair of parallel guide rods 47 and 48 are supported at their ends in lug members 45. Rod 48 is provided with spaced annular recesses 50a, 50b, 50c and 50:! which correspond to graduations 5, 10, 20 and 40, respectively, on the front cover plate.

A block 51 is slidable along rods 47 and 48. The block is equipped with a spring-pressed detent which consists of a leaf spring 52, that is attached to the block by a screw 53, and a ball 54 which is adapted to register with any selected one of the annular recesses to releasably maintain the block in a desired position with respect 1 extends through an opening in a member 60 which is disposed across the forward end of support unit 40 and is secured at its extremities to side members 44 by a corresponding clamp 61 and screw 62. Member 60 consists of a flexible resilient material, such as a woven elastic fabric tape. The portion of member 60, which is between lug members 45, is positioned closely adjacent the inner surface of front cover plate 17 and is so arranged as to prevent dust, dirt or other foreign particles from entering the casing through slot 22, while permitting movement of block 51 and associated parts along guide rails 47 and 48.

A lever 63 is pivotal about the axis of a pivot pin 64. This lever has a lateral extension 65. A tension spring 66 is connected at its ends to extension 65 and to support unit 40 and serves to normally and yieldingly bias lever 63 in a counter-clockwise direction, as viewed in Fig. 2, to the extent allowed by an adjustable stop element 67.

A second lever 70 is in the nature of a bell crank consisting of arms 71 and 72. The free end of arm 71 is provided with a sapphire-tipped stylus 73 which contacts and marks the upper surface of the chart strip as it rides along shelf 26, as shown in Figs. 1 and 2. Lever 70 is pivotal about the axis of a pivot pin 74 which is journaled at its ends in threaded insert bearings 75, one of which is shown in detail in Fig. 5. A post 76 is secured to and extends inwardly of support unit 40 (Figs. 6 and 7). A tension spring 77 is connected to the free end of post 76 and to lever arm 71. This spring normally and yieldingly biases lever 70 in a counter-clockwise direction about the axis of pin 74, as viewed in Fig. 2. A floating pin 78 serves as an articulating link between lever 63 and arm 72 of lever 70. This link is pointed at its ends and registers with cavities or recesses in lever 63 and arm 72, as best shown in Figs. 2 and 5. A flexible,

non-elastic member 80 connects lever 63'and arm 72, as shown in Fig. 5. This member is preferably a relatively thin thread of nylon and its function is to limit relative movement of the levers in a manner that might cause accidental disengagement of link 78.

For the purpose of describing the operation of the illustrated form of the invention, it is assumed that the apparatus has been assembled and that the parts are in the relative position shown in the drawings with ball detent'54 in registry with annular recess 50b of guide rod 48. This is the position of the parts to obtain a 10:1 amplification of vibrations.

The instrument is held in the hands and positioned so that the outer end of plunger 58 is in contact with a vibrating body, such as a motor bearing housing. Vibrations in the bearing housing are transmitted by plunger 58 to the illustrated linkage arrangement, consisting of lever 63, link 78 and lever 70, and thence by way of stylus 73 onto chart strip 24. It will be evident from an examination of the drawings that parts are so constructed and arranged that the vibrations in the bearing housing cause reciprocation of plunger 58 and that such reciprocation is translated by the linkage arrangement into corresponding oscillations of the stylus. Such oscillations are marked on the chart strip as it is advanced along shelf 26 by the clockwork motor.

The amplitude of the vibrations may be varied, as desired, within the limits of the instrument. With the parts in the relative position shown in the drawings, it

will be noted that the vibrations are amplified in the.

ratio of 10:1, as shown diagrammatically in Fig. 8. Fig. 9 illustrates the relative position of the plunger and linkage arrangement for a 20:1 amplification of individual vibrations.

It would be observed from an examination of Figs. 2 and S that the guide rods 47 and 48 are not parallel to lever 63 whenthe instrument is in the 10:1 ratio position. These parts would not, of course, be parallel when the parts are set in the 5:1 ratio position. If the guide rods and the plunger were set to give a movement to stylus 73 embracing full width of the chart strip in the 5:1 ratio position, the stylus would travel beyond the edge of the strip in the 40:1 ratio position. By adjusting the stop 67 for the desired angle and by proper design of the length of link 78, the stylus can be made to start and stop at the same points for the range of amplification ratios.

The illustrated construction form contemplates placing the outer end of the plunger in direct contact with a vibrating body. In instances where it is inconvenient or impossible to use the instrument in this manner, a probe may be attached to the instrument. Such a probe would include a tubular extension threadedly connected to adaptor 56 and a rod slidable in the tubular member and bearing against the outer end of plunger 58. The other end of such a rod would of course, contact the vibrating body and transmit such vibrations to the plunger.

The illustrated form of the invention contemplates translating reciprocatory movement of the plunger into oscillatory movement of the stylus. It will be apparent that the apparatus may be used to accomplish the reverse, namely to transmit and translate oscillatory movement of the free end of lever arm 71 into reciprocatory movement of the plunger.

From the foregoing, it is believed that the construction, operation, and advantages of the herein described invention will be apparent to those skilled in the art, without further description. It is to be understood, however, that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit, or sacrificing any of the advantages of the invention.

I claim 1. In apparatus for producing a record of frequencies of a vibratory body, a casing having an elongated slot in a wall thereof, a flexible resilient member positioned adjacent and coextensive with at least the portion of the casing wall which defines said slot, a chart strip at least partly within the casing, drive means for moving successiveincrements of the chart strip at a predetermined speed past a selected location in the casing, guide means carried in the casing and disposed to the side of the resilient member remote from the slot, a unit slidable along the guide means, detent means releasably maintaining the unit at any one of a plurality of spaced locations along the guide means, a plunger carried by and reciprocable in the unit, said plunger extending through the slot and the resilient member and having an inner end positioned in the casing and an outer end exterior the casing and adapted to bear against the vibratory body, and a linkage normally and yieldingly urging the plunger in one axial direction, said linkage comprising a first lever mounted in the casing for movement about a first pivotal axis and a second lever mounted in the casing for movement about a second pivotal axis in response to corresponding movement of the first lever. the inner end of the plunger engaging the first lever intermediate the first pivotal axis and the end of the first lever, said second lever including a pair of angularly disposed arms which intersect at said second pivotal axis, one of the arms being connected to the first lever, the other arm carrying a device which contacts and is adapted to mark the chart strip at said selected location.

2. In apparatus for transmitting and translating move ment, a support, a guide rod mounted on the support and having a plurality of longitudinally spaced recesses formed therein, a block slidable along the guide rod, spring pressed detent means carried by the block and adapted to releasably register with any selected one of the recesses in the guide rod, and a plunger carried by and re eiprocable relative to the block and a linkage normally and yieldingly urging the plunger in one axial direction, said linkage comprising a first lever mounted on the support and movable about a first pivotal axis and a second lever mounted on the support and movable about a sec-' 0nd pivotal axis in response to corresponding movement of the first lever, one end of the plunger engaging the first lever intermediate the first pivotal axis and the end of that lever, said second lever including a pair of angularly disposed arms which intersect at said second pivotal axis, one of the arms being connected to the first lever.

3. In apparatus for transmitting and translating movement, a support, a guide rod mounted on the support and having a plurality of longitudinally spaced recesses formed therein, a block slidable along the guide rod, spring pressed detent means carried by the block and adapted to releasably register with any selected one of the recesses in the guide rod, and a plunger carried by and reciprocable relative to the block a linkage comprising a first lever mounted on the support and movable about a first pivotal axis, a second lever mounted on the support and movable about a second pivotal axis, one end of the plunger engaging the first lever intermediate the first pivotal axis and the end of that lever, said second lever including a pair of angularly disposed arms which intersect at said second pivotal axis, a link connecting the first lever and an arm of the second lever, and resilient means normally biasing the levers in corresponding directions about their pivotal axes and urging the plunger in one axial direction relative to the support, the plunger being adapted upon axial movement in a reverse direction to impart pivotal movemet to the levers about their axes against the action of the resilient means.

4. Apparatus according to claim 3 wherein the ends of the link register with corresponding cavities formed in the first lever and said arm of the second lever, the apparatus including a flexible and substantially nonelastic element connected to the first lever and said arm of the second lever, said clement restraining the levers against relative pivotal movement which would result in disconnection of the link from the levers.

References Cited in the file of this patent UNITED STATES PATENTS 2,042,105 Kelley May 26, 1936 2,060,963 Van Degrift Nov. 17, 1936 2,080,665 Larson May 18, 1937 2,131,573 Snediker Sept. 27, 1938 2,239,330 Lorand Apr. 22, 1941 2,594,136 Di Maggie Apr. 22, 1952 2,729,104 Shuck et al Jan. 3, 1956 

